Its from new frontier.the lrho is built into the upper to hold the bolt back on glock and Colt 9mm and 45acp. Therefore, I am asking those who build if this could be made to work with the AR45 lower and the mags we use? Seems that some clever person should be able to make it work!

No...the issue with grease gun magazines is the lack of movement by the follower after the last round is fed......you need about 1/8 of an inch minimum of travel to actuate the bolt catch....it will require a redesign of the mag follower....and a way to mass produce them. I worked out a simple mechanism quite some time ago...just not enough of the afore mentioned follower movement to make it reliable.